[Amps] SPE 2K RTTY Duty Cycle

[Paul Christensen]

The big limitation with today's solid-state amps is cooling and noise level.
I won't purchase a solid-state amp above the 1KW level until the cooling
technology improves.  

Not sure if they do, but it would be interesting to try and obtain a no-time
limit (NTL) spec from SPE.   I have the 1K-FA model and I suspect it's real
NTL output power is only a couple hundred watts.  At 1KW output power, It
does very well with SSB, but struggles in CW with the fans quickly going
full-speed to keep adequate cooling.  RTTY power would have to be scaled way
back if used in a RTTY contest.      

Paul, W9AC

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Dennis W0JX via
Amps
Sent: Monday, May 18, 2015 1:19 PM
To: qrv at kd4e.com
Cc: amps at contesting.com
Subject: Re: [Amps] SPE 2K RTTY Duty Cycle

What I was seeking was how much "headroom" the SPE 2K has. I run my AL-800H
at no more than 1000 watts out on RTTY, usually chasing DX. I am not an RTTY
contester but I would like a new amp to have plenty of cushion so it is
cruising at legal limit. AFAIK, the tube Alphas and the ACOM 2000A will
provide this cushion. Apparently, today's popular transistor amps will not
(yet).

73, Dennis W0JX
--------------------------------------------
On Mon, 5/18/15, qrv at kd4e.com <qrv at kd4e.com> wrote:

 Subject: Re: [Amps] SPE 2K RTTY Duty Cycle
 To: "Dennis W0JX" <w0jx at yahoo.com>
 Cc: "Dennis W0JX via Amps" <amps at contesting.com>
 Date: Monday, May 18, 2015, 12:57 PM
 
 PEP is not the same thing
 as key-down RTTY by a long shot.
 
 How many switches, feedlines, and antennas,  external to the  amp can
survive 1500w  carrier for long?
 
 Especially heating at imperfect and/or marginal  contacts  and connections?
 
 I'm seeing estimates of 5
 seconds, 10 seconds, and 15 seconds
 of 1500w
 output in RTTY continuous-duty mode - but unlimited  at 1KW.
 
 Most
 vendors will be cautious about running-at-the-edge as  they know that some
Hams will push that margin  then blame  them when something breaks.
 
 Question:
 Is
 RTTY so inefficient that one really needs 1500w output?
 
 There are many other
 keyboard-keyboard digi modes that can
 hold a
 qso under poor conditions at 30-50w.
 
 Just wondering ...
 
 David KD4E
 
 > I
 asked this very question from one of the two SPE vendors at  Dayton.
 > I got very evasive responses
 until I insisted on a plain and simple
 >
 answer. Finally, the vendor stated that if you start at 1500  w out on  >
RTTY, the power will cut back  to 1200 watts after ten seconds. I was  >
disappointed in his rather defensive posture on the question  of  >
headroom. Yet there was a sign up  that said the power out was 2000  > PEP
CW/SSB.
 >
 > 73,
 Dennis W0JX
 
 
 -- 
 
 *David*
 KD4E
 ARES-EC Bulloch County, Nevils, Georgia  USA
 
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